Within Cholesteric Phase Patents (Class 349/175)
  • Patent number: 10359626
    Abstract: The invention relates to a display, in particular an autostereoscopic or holographic display, for representing preferably three-dimensional information, wherein the stereo views or the reconstructions of the holographically encoded objects can be tracked to the movements of the associated eyes of one or more observers in a finely stepped manner within a plurality of zones of the movement region. In this case, the zones are selected by the activation of switchable polarization gratings.
    Type: Grant
    Filed: November 18, 2016
    Date of Patent: July 23, 2019
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventor: Norbert Leister
  • Patent number: 10354576
    Abstract: An optical device includes a display panel displaying an image and an optical modulation device that includes a first plate and second plate disposed to face each other and a liquid crystal layer disposed between the first plate and the second plate and including a plurality of liquid crystal molecules, wherein the first plate includes a plurality of lower electrodes extending in a first direction and arranged in a second direction crossing the first direction and the second plate include and an upper electrode. When the display panel displays a first image during a first subframe, the optical modulation device applies a first driving signal to the plurality of lower electrodes, and when the display panel displays a second image during a second subframe following the first subframe, the optical modulation device applies a second driving signal different from the first driving signal to the plurality of lower electrodes.
    Type: Grant
    Filed: March 1, 2016
    Date of Patent: July 16, 2019
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Jung-Hyun Cho, Junghwan Yi, Chunki Choi
  • Patent number: 10120117
    Abstract: The present invention provides a backlight module. The backlight module includes a plastic frame, a backlight source and a light guide plate. The backlight source and the light guide plate are received in the plastic frame. The light guide plate includes a light incident surface and a light emitting surface. The backlight source includes a circuit board, a reflecting collimator lens fixed to the circuit board and a LED lamp disposed inside the reflecting collimator lens. The reflecting collimator lens includes a parabolic reflecting surface, and the LED lamp is located at a center location of the parabolic reflecting surface. The light incident surface is covered with a color polarizing layer, and the parabolic reflecting surface faces toward the color polarizing layer. The present invention also discloses a display device.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: November 6, 2018
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventor: Yong Fan
  • Patent number: 9791737
    Abstract: A display device includes: a display panel; a light source configured to supply light to the display panel; a mold frame on which the display panel is disposed; and a bottom chassis on which the light source is disposed, and which is coupled to the mold frame. The mold frame includes: a base unit disposed between the display panel and the light source, and having a panel form; and a side wall portion which is bent and which extends from the base unit.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: October 17, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventor: Won Gap Yoon
  • Patent number: 9709839
    Abstract: A liquid crystal electronic curtain is disclosed. The liquid crystal electronic curtain includes a liquid crystal layer between first and second substrates. The curtain also includes a polarizer on one of a side of the first substrate away from the second substrate, and a side of the second substrate away from the first substrate. The curtain also includes a first electrode layer on a side of the first substrate facing the second substrate. The first electrode layer includes touch display units, and first electrode leads, each connected with one of the touch display units. The touch display units are connected with detection circuits via the first electrode leads. The curtain also includes a second electrode layer disposed on a side of the second substrate facing the first substrate, a driving circuit, and a second electrode lead, where the driving circuit is connected with the second electrode lead.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: July 18, 2017
    Assignees: SHANGHAI TIANMA MICRO-ELECTRONICS CO., LTD., TIANMA MICRO-ELECTRONICS CO., LTD.
    Inventors: Lihua Wang, Xiaoping Sun, Xiaofei She, Conghua Ma
  • Patent number: 9617473
    Abstract: The present invention relates to a switch element, which is thermoresponsive and which switches between a less transmissive state for radiant energy and a more transmissive state for radiant energy, and which comprises a liquid-crystalline medium. The invention furthermore relates to the use of the switch element for the regulation of radiant energy flow between interior spaces and the environment and for the regulation of the temperature of interior spaces. The invention furthermore relates to a liquid-crystalline medium, characterised in that it comprises 5-95% of a compound of the formula (I), in particular for use in the switch elements according to the invention.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: April 11, 2017
    Assignee: Merck Patent GmbH
    Inventor: Michael Junge
  • Patent number: 9575317
    Abstract: An optical guide comprises at least one guiding element adapted for enabling, by total internal reflections, transporting an image taking the form of a collimated light beam from an injection zone to an extraction zone where an extracting device for extracting the image is mounted. The optical guide comprises a retardation plate and a polarization beam splitter, the polarization beam splitter being placed between the guiding element and the extracting device. The optical guide is such that each ray of said collimated light beam striking the polarization beam splitter for the first time separates into two portions, a first portion being transmitted to the extracting device so as to define a first light imprint and a second portion being reflected by the polarization beam splitter, said second portion continuing to be guided by the guiding element and thus passing twice through the retardation plate before striking the polarization beam splitter so as to define a second light imprint.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: February 21, 2017
    Assignee: OPTINVENT
    Inventors: Khaled Sarayeddine, Xavier Hugel, Pascal Benoit
  • Patent number: 9568772
    Abstract: An electronic device may be provided with a display mounted in a housing. The display may include a liquid crystal display module and a reflective polarizer having an in-plane optical axis. The display may also include a backlight unit that includes a light source, a light guide element, and a reflector film coupled to a backside of the light guide element. The display may also include a light retardation layer such as a quarter wave film. The quarter wave film may be arranged between the reflective polarizer and the reflector film of the backlight unit. Partially polarized light that is output from a front side of the light guide element may have a first component parallel to the in-plane optical axis and a second component perpendicular to the in-plane optical axis of the reflective polarizer. The second component may be reflected from the reflective polarizer.
    Type: Grant
    Filed: April 13, 2015
    Date of Patent: February 14, 2017
    Assignee: Apple Inc.
    Inventors: Xinyu Zhu, Jun Qi, Meizi Jiao, Nicholas G. Roland, Victor H. Yin, Wei Chen, Ming Xu, Cheng Chen, Zhibing Ge
  • Patent number: 9019465
    Abstract: Provided are a liquid crystal lens, an optical filter, and a display device. The exemplary liquid crystal lens may exhibit optical anisotropy and optical isotropy according to a polarization state of incident light. When the liquid crystal lens is applied to a display device capable of generating a 2D image and a 3D image, the 3D image may be seen without glasses in the state of the optical anisotropy, and the 2D image can be seen in the state of the optical isotropy.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: April 28, 2015
    Assignee: LG Chem, Ltd.
    Inventors: Byoung Kun Jeon, Su Young Ryu, Moon Soo Park
  • Patent number: 8994897
    Abstract: There is provided a reflective liquid crystal display device including a first liquid crystal panel containing a first liquid crystal material that reflects light of a first color, a second liquid crystal panel containing a second liquid crystal material that reflects light of a second color and a third liquid crystal material that reflects light of a third color, the second and third liquid crystal materials positioned to be distinct from each other, and a light absorption layer that is bonded to a lower surface of the second liquid crystal panel, wherein the second liquid crystal panel is bonded to a lower surface of the first liquid crystal panel, and the first to third liquid crystal materials reflect light in a planar state and transmit light in a focal conic state.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: March 31, 2015
    Assignee: Intellectual Discovery Co., Ltd.
    Inventors: Hyun Ha Hwang, Seung Gon Kang, Heon Kyu Kim
  • Patent number: 8994902
    Abstract: A display device includes; a first substrate, a second substrate disposed substantially opposite to the first substrate, a third substrate disposed between the first substrate and the second substrate, a color display layer disposed between the first substrate and the third substrate, the color display layer comprising a cholesteric liquid crystal, a first electrode and a second electrode electrically connected to the color display layer, a color conversion layer disposed between the third substrate and the second substrate, and a third electrode and a fourth electrode electrically connected to the color conversion layer.
    Type: Grant
    Filed: March 19, 2009
    Date of Patent: March 31, 2015
    Assignee: Samsung Display Co., Ltd.
    Inventors: Sang-Il Kim, Nam-Seok Roh
  • Patent number: 8994912
    Abstract: A transparent display device includes a cholesteric liquid crystal display (LCD) panel to display an image, a first polarized sheet arranged on one side of the cholesteric LCD panel, and a first ¼ phase delay sheet arranged between the first polarized sheet and the display panel.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: March 31, 2015
    Inventors: Chiachiang Hsiao, Chihwen Chen
  • Patent number: 8988638
    Abstract: A polarization-sensitive beaded retro-reflective sheeting having cholesteric liquid crystal material as the specular reflective coating and methods of making the same are described.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: March 24, 2015
    Inventor: Yingqiu Jiang
  • Patent number: 8947620
    Abstract: The invention provides a broadband cholesteric liquid crystal film, a method for fabricating the same, a polarization device employing the same, and high light efficiency liquid crystal display employing the same. The cholesteric liquid crystal film is a single-layer liquid crystal material structure, and has a top surface and a bottom surface. Further, the cholesteric liquid crystal film includes a first region, a second region, and a third region, and the first region is adjacent to the top surface of the cholesteric liquid crystal film, the third region is adjacent to the bottom surface of the cholesteric liquid crystal film, and the second region is located between the first and third regions, and the average helical pitch P1 of the first region and the average helical pitch P3 of the third region are both larger than the average helical pitch P2 of the second region.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: February 3, 2015
    Assignee: Industrial Technology Research Institute
    Inventors: Hui-Lung Kuo, Mei-Chih Peng, Yi-Ping Hsieh, Chin-Kai Chang
  • Publication number: 20150029692
    Abstract: A backlight unit which provides light to a liquid crystal display panel of a liquid crystal display. The backlight unit includes an optical lens module including an optical lens disposed above a point light source and configured to refract light output from the point light source, and a reflective polarization layer disposed directly on the optical lens and configured to separate polarization components of the light to transmit one polarization component and reflect another polarization component.
    Type: Application
    Filed: December 16, 2013
    Publication date: January 29, 2015
    Applicant: Samsung Display Co., Ltd.
    Inventors: Seung Hwan CHUNG, Dong-Yeol Yeom, Joong Hyun Kim, Jin Sook Bang, Sang Woo Ha
  • Patent number: 8867005
    Abstract: A display element having high response property, wide viewing angle property, and high contrast property, and exhibiting a wide driving temperature range and excellent durability and reliability. Between two facing substrates (1, 2), a cholesteric liquid crystal layer (3) made of a liquid crystal material exhibiting a cholesteric phase whose spontaneous twist pitch is shorter than a wavelength of visible light is provided. Facing planes of the substrates (1, 2) are provided with alignment films (8, 9) for aligning liquid crystal molecules near the interface of the substrate in a specific direction. Furthermore, the planes are provided with electrodes (4, 5) for applying an electric field on the cholesteric liquid crystal layer (3) in a direction substantially parallel to a plane of each substrate. The cholesteric liquid crystal layer (3) exhibits optical isotropy in the direction parallel to the plane of each substrate when no voltage is applied.
    Type: Grant
    Filed: June 9, 2006
    Date of Patent: October 21, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Iichiro Inoue, Koichi Miyachi, Seiji Shibahara
  • Patent number: 8797497
    Abstract: An unpolarized light beam phase modulator emitting in a given wavelength range comprises at least one cell containing a liquid crystal having a helical structure and means for applying a voltage to said cell, said liquid crystal having a torsion elastic constant greater than its twisting elastic constant so as to ensure continuous stable behavior voltage-wise, said liquid crystal having a sufficient number of turns and in which the axis of the turns is in the light-propagation direction, making it possible to obtain an optical effect generated by the liquid crystal on the electrical field that is identical regardless of the direction of this electrical field, said cell being transparent in said wavelength range.
    Type: Grant
    Filed: March 7, 2011
    Date of Patent: August 5, 2014
    Assignee: Commissariat a l'Energie Atomique et aux Energies
    Inventors: Umberto Rossini, Bruno Mourey
  • Patent number: 8711312
    Abstract: A liquid crystal display device using a liquid crystal material exhibiting a blue phase is provided to achieve higher contrast. Further, the power consumption of the liquid crystal display device using a liquid crystal exhibiting a blue phase is reduced. In a liquid crystal display device including: a first substrate provided with a pixel electrode layer (also referred to as a first electrode layer); and a second substrate provided with a common electrode layer (also referred to as a second electrode layer), between which a liquid crystal layer exhibiting a blue phase is interposed, the pixel electrode layer and the common electrode layer project into the liquid crystal layer and are arranged so that the adjacent pixel electrode layer and common electrode layer engage with each other at a distance with the liquid crystal layer interposed therebetween.
    Type: Grant
    Filed: April 8, 2011
    Date of Patent: April 29, 2014
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Daisuke Kubota, Akio Yamashita, Tetsuji Ishitani, Tomohiro Tamura
  • Patent number: 8704996
    Abstract: A cholesteric liquid crystal device is provided. The cholesteric liquid crystal device includes a first substrate, a second substrate disposed opposite to the first substrate, a first reflective layer disposed over the first substrate, a second reflective layer disposed over the second substrate, facing the first reflective layer, and a partition structure disposed between the first and the second substrates, wherein a cavity is formed by the partition structure, the first reflective layer and the second reflective layer, and a cholesteric liquid crystal layer is filled in the cavity.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: April 22, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Kuan-Ting Chen, Yi-Shou Tsai
  • Patent number: 8687145
    Abstract: An exemplary embodiment of the present invention provides an organic electroluminescent device including a substrate, a first electrode, one or more organic material layers, and a second electrode in a sequentially deposited form, wherein a light scattering layer is provided between the substrate and the first electrode, and includes a cholesteric liquid crystal layer including a liquid crystal vertically aligned to the substrate, and a method for fabricating the same.
    Type: Grant
    Filed: August 12, 2011
    Date of Patent: April 1, 2014
    Assignee: LG Chem, Ltd.
    Inventors: Yeon Keun Lee, Dae Hee Lee, Moon Soo Park, Yun Hye Hahm, Jung Bum Kim, Mun Kyu Joo
  • Patent number: 8558799
    Abstract: The invention relates to a user interaction device (200, 300) comprising an optical module (210, 310) having a layer (5) of a substance being electrically switchable between a first visual state and a second visual state, and an electrical switch (6a, 6b) for electrically switching the substance between the first and second visual states, a detector (6a, 11b) for detecting the presence of a physical object, and a control unit (290, 390) for controlling the electrical switch in response to the detection of presence of the physical object.
    Type: Grant
    Filed: December 18, 2006
    Date of Patent: October 15, 2013
    Assignee: Koninklijke Philips N.V.
    Inventors: Galileo June Destura, Armanda Cinderella Nieuwkerk, Johan Thomas Oostveen
  • Patent number: 8531627
    Abstract: A main object of the present invention is to provide a rotating plate hardly generating variation in the rotation angle of the liner polarization so as to easily realize a desired rotation angle, and a liquid crystal display device enabling observation of a bright image by use thereof even in a state with a polarizing glasses put on. To attain the object, the present invention provides an optical rotation plate comprising a transparent substrate, and an optical rotation layer formed on the transparent substrate and containing a rod-shaped compound for forming a cholesteric structure and having a function of rotating transmitted liner polarization, wherein the cholesteric structure has a 90 degrees or larger twist angle and a pitch in a range of 450 nm to 4,000 nm.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: September 10, 2013
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Satoru Hamada, Keiji Kashima, Takashi Kuroda, Hirofumi Yumoto
  • Publication number: 20130208226
    Abstract: A discrimination medium, which can have much information, can be produced on a small scale at low cost, and enables change of a sticker design at low cost, is provided. The discrimination medium includes an optically transparent first substrate on which a cholesteric liquid crystal layer is formed, the cholesteric liquid crystal layer being formed with a fine asperity used for displaying a hologram, an optically transparent second substrate on which a print layer is formed, the print layer having a predetermined pattern made of ink and having a transparent portion without the ink of the pattern around the pattern, the pattern reflecting or absorbing a light of a predetermined wavelength, and a transparent adhesive layer,wherein the optically transparent first substrate, the optically transparent second substrate, and the transparent adhesive layer, are disposed in turn from a side checked visually.
    Type: Application
    Filed: March 15, 2013
    Publication date: August 15, 2013
    Applicant: NHK SPRING CO., LTD.
    Inventor: NHK SPRING CO., LTD.
  • Patent number: 8508695
    Abstract: A polymer-dispersed liquid crystal system has a continuous polymer structure having defined therein a plurality of discrete bodies of liquid crystal material. The bodies of liquid crystal material exhibit a polydomain operating state in which the liquid crystal material within each body is arranged in multiple domains, each domain being defined by a quantity of liquid crystal material whose molecules have a substantially common identifiable alignment in at least one axis, wherein the resolved alignments of neighboring domains diverge substantially from one another and are stable over time.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: August 13, 2013
    Assignee: Vlyte Innovations, Ltd
    Inventor: Donal O'Keeffe
  • Patent number: 8426012
    Abstract: A liquid crystal polymer marking is obtainable by a process that comprises applying a first chiral liquid crystal precursor composition onto a substrate, heating the composition to bring same to a first chiral liquid crystal state, applying to at least one area of the first composition a second chiral liquid crystal precursor composition, heating the at least one area to bring same to a second chiral liquid crystal state, and subsequently curing and/or polymerizing the resultant product. This abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.
    Type: Grant
    Filed: May 19, 2010
    Date of Patent: April 23, 2013
    Assignee: Sicpa Holding SA
    Inventors: Thomas Tiller, Frédéric Gremaud, Andrea Callegari
  • Patent number: 8421987
    Abstract: A discrimination medium, which can have much information, can be produced on a small scale at low cost, and enables change of a sticker design at low cost, is provided. A cholesteric liquid crystal layer, having a fine asperity for forming a hologram, is formed on a transparent first substrate. A print layer composed of a black ink is formed on a transparent second substrate. The substrates are affixed to each other via a bond layer, so that a discrimination medium is obtained. In the discrimination medium, the display content obtained by the print layer is changed, so that the display content for discrimination can be changed at low cost.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: April 16, 2013
    Assignee: NHK Spring Co., Ltd.
    Inventors: Hidekazu Hoshino, Tokio Sakauchi, Mutsumi Sasaki, Tohru Ida, Naomi Iida
  • Patent number: 8363203
    Abstract: A liquid crystal display includes a display section performing display using a liquid crystal, a substrate disposed to face a bottom surface of the display section and having a circuit for driving the liquid crystal mounted thereon, and a heat diffusing section disposed in contact with the bottom surface of the display section and a top surface of the substrate and having thermal conductivity higher than the thermal conductivity of air.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: January 29, 2013
    Assignee: Fujitsu Limited
    Inventors: Masaki Nose, Hisashi Yamaguchi
  • Patent number: 8363173
    Abstract: An optical touch screen device includes a light output panel, a first polarizer, a first light-pervious plate, a liquid crystal layer and an image capture module. The light output panel includes a first surface for outputting light rays. The first polarizer is stacked on the first surface. The first light-pervious plate is arranged facing the first polarizer. The liquid crystal layer is arranged between the first polarizer and the first light-pervious plate. The liquid crystal layer includes a plurality of liquid crystal molecules aligned in predetermined orientations. The image capture module has a viewing field covering an entire surface of the first light-pervious plate. The image capture module includes a second polarizer. The second polarizer has a polarization axis associated thereof. The liquid crystal layer is configured for causing light transmitting therethrough to have a polarization direction perpendicular to the second polarization axis.
    Type: Grant
    Filed: January 26, 2010
    Date of Patent: January 29, 2013
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventors: Tsung-Heng Chang, Chi-Wei Chiu, Chun-Cheng Ko
  • Patent number: 8363200
    Abstract: A display element comprises: a pair of substrates disposed opposite to each other; a liquid crystal enclosed between the pair of substrates; a wall structure which is formed to surround a pixel region and which is in contact with both of the pair of substrates; and an opening section which is an opening provided in a part of the wall structure to allow the liquid crustal to flow out of the pixel region.
    Type: Grant
    Filed: February 23, 2009
    Date of Patent: January 29, 2013
    Assignee: Fujitsu Limited
    Inventors: Masaki Nose, Junji Tomita, Tsuneo Watanuki, Toshiaki Yoshihara
  • Patent number: 8345206
    Abstract: A liquid crystal display includes a liquid crystal layer causing a selective reflection and exhibiting Kerr effect, first and second electrodes applying voltage to the liquid crystal layer, a first circular polarizer disposed between the liquid crystal layer and a viewer and allowing a first circularly polarized light incident on the liquid crystal layer when irradiated with a natural light, the first circularly polarized light having an electric-field vector rotating in a direction reverse to a rotation direction of an electric-field vector of a circularly polarized light selectively reflected by the liquid crystal layer, and a second circular polarizer facing the first circular polarizer with the liquid crystal layer interposed therebetween and allowing a second circularly polarized light incident on the liquid crystal layer when irradiated with a natural light.
    Type: Grant
    Filed: September 23, 2009
    Date of Patent: January 1, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Rei Hasegawa, Yuko Kizu, Hajime Yamaguchi
  • Publication number: 20120327356
    Abstract: An unpolarized light beam phase modulator emitting in a given wavelength range comprises at least one cell containing a liquid crystal having a helical structure and means for applying a voltage to said cell, said liquid crystal having a torsion elastic constant greater than its twisting elastic constant so as to ensure continuous stable behavior voltage-wise, said liquid crystal having a sufficient number of turns and in which the axis of the turns is in the light-propagation direction, making it possible to obtain an optical effect generated by the liquid crystal on the electrical field that is identical regardless of the direction of this electrical field, said cell being transparent in said wavelength range.
    Type: Application
    Filed: March 7, 2011
    Publication date: December 27, 2012
    Applicant: Commissariat a l'Energie Atomique et aux Energies Alternatives
    Inventors: Umberto Rossini, Bruno Mourey
  • Patent number: 8339528
    Abstract: To provide an erasing device whose power consumption required for erasing operations is suppressed, which does not spoil the portability of an optical writing type display medium. In a first display function layer, voltages applied to two cholesteric liquid crystal layers when an erasing voltage is applied between a pair of electrodes are defined as V1, V2, respectively, and threshold voltages with which the cholesteric liquid crystal layers change to the homeotropic alignment are defined as Vth1, Vth2, respectively. In that case, in a state the voltages V1 and V2 are determined according to only each resistance of the cholesteric liquid crystal layers and resistance of a photoconductive layer, i.e., a sufficient time has passed from a point at which the erasing voltage is applied, V1?Vth1 and V2?Vth2 apply.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: December 25, 2012
    Assignee: NLT Technologies, Ltd.
    Inventors: Kenichi Mori, Tetsushi Satou, Koji Shigemura, Setsuo Kaneko
  • Patent number: 8329058
    Abstract: A photodisplay device in which an optically addressed image can be viewed indefinitely, erased and readdressed with a new image is disclosed. Optically responsive reversible photochiral materials are incorporated into a bistable cholesteric liquid crystal in an electrooptic display cell. A high resolution image exposed on the cell is fixed by a low voltage pulse to unpatterned electrodes and can be, at a later time, erased with a high voltage pulse.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: December 11, 2012
    Assignees: Kent Displays Incorporated, Kent State University
    Inventors: Quan Li, Lisa M. Green, J. William Doane, Asad A. Khan, Nithya Venkataraman, Irina Shiyanovskaya
  • Patent number: 8310631
    Abstract: In this disclosure, a blue colorant is added in the adhesion layer of a reflective polarizer to compensate the chromaticity difference caused by the reflective polarizer itself and large horizontal viewing angle. The chromaticity difference can be further reduced by adding beads in the adhesion layer and/or forming light-gathering microstructures on the outer surface of the quarter wave plate of the reflective polarizer.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: November 13, 2012
    Assignee: Eternal Chemical Co., Ltd.
    Inventors: Yu-Ming Sun, Chin-Yi Liao
  • Patent number: 8279394
    Abstract: An object of the present invention is to provide a discrimination medium which has high discrimination ability, and which is more difficult to counterfeit than conventional discrimination mediums. A discrimination medium comprises: a cholesteric liquid crystal layer; and a liquid crystal layer acting as a half-wave plate and provided on the cholesteric liquid crystal layer in a predetermined pattern.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: October 2, 2012
    Assignees: NHK Spring Co., Ltd., Nippon Oil Corporation
    Inventors: Hidekazu Hoshino, Itsuo Takeuchi, Suzushi Nishimura, Gorou Suzaki
  • Publication number: 20120169960
    Abstract: The invention provides a broadband cholesteric liquid crystal film, a method for fabricating the same, a polarization device employing the same, and high light efficiency liquid crystal display employing the same. The cholesteric liquid crystal film is a single-layer liquid crystal material structure, and has a top surface and a bottom surface. Further, the cholesteric liquid crystal film includes a first region, a second region, and a third region, and the first region is adjacent to the top surface of the cholesteric liquid crystal film, the third region is adjacent to the bottom surface of the cholesteric liquid crystal film, and the second region is located between the first and third regions, and the average helical pitch P1 of the first region and the average helical pitch P3 of the third region are both larger than the average helical pitch P2 of the second region.
    Type: Application
    Filed: October 28, 2011
    Publication date: July 5, 2012
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Hui-Lung Kuo, Mei-Chih Peng, Yi-Ping Hsieh, Chin-Kai Chang
  • Patent number: 8203688
    Abstract: A liquid crystal display includes: a transparent first substrate placed on the display plane side; a transparent second substrate opposed to the first substrate; a cholesteric liquid crystal that is placed between the first and second substrates and whose selective reflection color is yellow; and a reflector for white/blue display opposed to the second substrate. The angular dependence of scattered light intensity of the reflector for white/blue display is equivalent to the angular dependence of scattered light intensity of the cholesteric liquid crystal.
    Type: Grant
    Filed: February 22, 2008
    Date of Patent: June 19, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Ippei Inoh
  • Patent number: 8176924
    Abstract: Electronic color changing artificial nails comprise a polymer layer in a general shape of a human natural nail, bistable electro-optic material and a ledge on which display electrodes are disposed located at a tip of the artificial nail. Once the artificial nail is attached to the natural nail, the artificial nail can be updated by simply plugging the tip into a separate electronic color changing device which is used to set the color of the nail to whatever the user desires.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: May 15, 2012
    Assignee: Kent Displays Incorporated
    Inventors: Tod Schneider, Debra Chaney
  • Patent number: 8149343
    Abstract: The present invention relates to a display device having an image-emitting panel and an image dividing sheet. The image-emitting panel includes a light-blocking layer, a lower substrate, an upper substrate and an electro-optic layer. The lower substrate includes pixel electrodes into which a first image signal and a second image signal having different viewing angles are applied in a spatial dividing method. The electro-optic layer reflects a circularly polarized light towards the upper substrate. The image dividing sheet includes a first optical element and a second optical element. The first optical element converts the circularly polarized light into a first light corresponding to the first image signal. The second optical element converts the circularly polarized light into a second light corresponding to the second image signal.
    Type: Grant
    Filed: June 25, 2009
    Date of Patent: April 3, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Nak-Cho Choi, Sung-Woon Kim, Hee-Keun Lee
  • Publication number: 20120038876
    Abstract: An exemplary embodiment of the present invention provides an organic electroluminescent device including a substrate, a first electrode, one or more organic material layers, and a second electrode in a sequentially deposited form, wherein a light scattering layer is provided between the substrate and the first electrode, and includes a cholesteric liquid crystal layer including a liquid crystal vertically aligned to the substrate, and a method for fabricating the same.
    Type: Application
    Filed: August 12, 2011
    Publication date: February 16, 2012
    Inventors: Yeon Keun Lee, Dae Hee Lee, Moon Soo Park, Yun Hye Hahm, Jung Bum Kim, Mun Kyu Joo
  • Publication number: 20120026421
    Abstract: A display panel includes a first substrate and a second substrate facing the first substrate. The second substrate includes a first electrode and a second electrode spaced apart from each other. A cholesteric liquid crystal having a pitch shorter than a wavelength of a visible ray and a rotation axis substantially perpendicular to the first and second substrates is disposed between the first and second substrates. The display panel displays a grayscale image in response to an electric field generated between the first and second electrodes. A polymer is added to the cholesteric liquid crystal, and a concentration of the polymer is controlled by exposing the polymer to a light. The concentration of the polymer in an area adjacent to the first substrate may be higher than the concentration of the polymer in an area adjacent to the second substrate.
    Type: Application
    Filed: June 30, 2011
    Publication date: February 2, 2012
    Inventors: JAE HONG PARK, Suk Choi, Ohjeong Kwon, Hyelim Jang, Sung-Jae Yun, Hyeokjin Lee, Yong Woon Lim, Heeseop Kim
  • Patent number: 8102490
    Abstract: In order to provide a cholesteric liquid crystal display element of a structure capable of forming a color in the background by means of a low cost electrode structure and burying an Off display color completely in the background color, the color of the display part and background part of the display element is formed by a color reflection state and a transparent state. This configuration makes it possible to form a color in the background so as to bury the Off display color completely in the background by employing a low cost electrode structure, thereby improving a suitability to an industrial design and accomplish a display of a good visibility.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: January 24, 2012
    Assignee: Fujitsu Limited
    Inventor: Junji Tomita
  • Patent number: 8085363
    Abstract: The invention relates to a patternable coatable electrically conductive layer comprising a fluid-coated electrically conductive material, wherein the fluid-coated electrically conductive material has sufficient conductivity to induce an electric field strong enough to change the optical state of a light modulating material and a display comprising a substrate, at least one patternable coatable electrically conductive layer comprising a fluid-coated electrically conductive material, wherein said fluid coated electrically conductive material has sufficient conductivity to induce an electric field strong enough to change the optical state of a light modulating material which has a first and a second field-switched stable optical state, and an imaging layer comprising said light modulating material disposed over said at least one patternable fluid-coated electrically conductive layer.
    Type: Grant
    Filed: September 20, 2006
    Date of Patent: December 27, 2011
    Assignee: Industrial Technology Research Institute
    Inventors: Stanley W. Stephenson, Mary C. Brick, Terry J. Martin
  • Patent number: 8081272
    Abstract: In a preparation method, a chiral or cholesteric liquid crystal, a photoreactive monomer, and a photoinitiator are disposed in a liquid crystal cell. A principal surface of the liquid crystal cell is illuminated with ultraviolet light selected to have a non-uniform ultraviolet light intensity profile in the liquid crystal cell. The illuminating cooperates with the photoinitiator to polymerize at least a portion of the photoreactive monomer near the principal surface to generate a polymer network having a density corresponding to the non-uniform ultraviolet light intensity profile. The polymer network biases the liquid crystal toward a selected helical alignment direction. In some embodiments, the illuminating includes illuminating with first and second ultraviolet light intensity profiles to produce surface and volume polymer network components.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: December 20, 2011
    Assignees: Kent State University
    Inventors: Lachezar Komitov, Liang-Chy Chien, Sang Hwa Kim
  • Patent number: 8081289
    Abstract: An enhanced wavelength-converting structure is disclosed. The enhanced wavelength-converting structure includes a substrate, a wavelength-converting layer arranged next to the substrate, and a wavelength-selective reflecting layer arranged next to the wavelength-converting layer. The wavelength-converting layer converts the first light into the second light. A part of the second light radiating backward to the light source is further reflected toward the substrate by the wavelength-selective reflecting layer to form the enhanced second light by combining with another part of the second light radiating toward the substrate.
    Type: Grant
    Filed: August 6, 2008
    Date of Patent: December 20, 2011
    Assignee: Universal Optoelectronics Co., Ltd.
    Inventors: Yu-Ping Lin, Chih-Yuan Chen, Pei-Ju Lai, Ding-He Chen
  • Patent number: 8045129
    Abstract: A display device includes a plurality of gate lines and a plurality of data lines crossing each other on a first substrate, to define a pixel; a first thin film transistor in a portion where the gate lines and the data lines cross each other; a plurality of position detection lines on the first substrate, the position detection lines spaced a constant distance from the data lines and crossing the gate lines; a second thin film transistor for detecting a position, in a portion on the first substrate where the gate lines and the position detection lines cross each other; a protrusion pattern protruding from a second substrate and corresponding to a drain electrode of the second thin film transistor; and a transparent conductive layer on the protrusion pattern, electrically connected to the drain electrode when touching.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: October 25, 2011
    Assignee: LG Display Co., Ltd.
    Inventors: Hee Kwang Kang, Jun Hyeok Yu, Mi Young Do, Il Ho Kim
  • Patent number: 8009263
    Abstract: A bistable display having one or more permanent hideable mark, and a method of forming the permanent hideable mark, are described. The permanent hideable mark can be hidden and revealed numerous times without loss of information.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: August 30, 2011
    Assignee: Industrial Technology Research Institute
    Inventors: Xiang-Dong Mi, Stanley W. Stephenson, III
  • Patent number: 7990515
    Abstract: A bistable display having one or more permanent hideable mark, and a method of forming the permanent hideable mark, are described. The permanent hideable mark can be hidden and revealed numerous times without loss of information.
    Type: Grant
    Filed: December 10, 2004
    Date of Patent: August 2, 2011
    Assignee: Industrial Technology Research Institute
    Inventors: Xiang-Dong Mi, Stanley W. Stephenson, III
  • Publication number: 20110102730
    Abstract: The invention provides a liquid crystal device. The liquid crystal device includes a first transparent substrate and a second transparent substrate, wherein the first transparent substrate and the second transparent substrate are parallel to each other. Spacers are formed between the first transparent substrate and the second transparent substrate, to define a cavity; and a cholesteric liquid crystal is disposed into the cavity. Particularly, the liquid crystal device is coupled to a supply voltage, and three states of the liquid crystal device are selectively switched by adjusting the voltage, wherein the three states includes a first transparent state, a scattering state and a second transparent state.
    Type: Application
    Filed: May 9, 2010
    Publication date: May 5, 2011
    Applicant: NATIONAL TAIWAN UNIVERSITY
    Inventors: I-Hui Lee, Yu-Ching Chao, Yu-Chi Chen, Liang-Chao Chang, Chih-Cheng Hsu, Jiunn-Yih Lee, Tien-Lung Chiu, Jiun-Haw Lee
  • Publication number: 20110095518
    Abstract: A security element for securing valuable articles comprises an optically variable layer (18) that conveys different color impressions at different viewing angles, and a color-constant layer (17, 24). The optically variable layer (18) and the color-constant layer (17, 24) are stacked in a covering region (20), while at most one of the optically variable layer (18) and the color-constant layer (17, 24) is present outside (22) the covering region. The color impression of the stacked layers (18, 17, 24) in the covering region (20) and the color impression of the one layer (18) outside (22) the covering region are matched with each other when viewed at a predetermined viewing angle. Further, the color-constant layer comprises an ink layer (17) and a metal layer arranged below the ink layer (24).
    Type: Application
    Filed: July 2, 2009
    Publication date: April 28, 2011
    Applicant: GIESECKE & DEVRIENT GMBH
    Inventors: Winfried Hoffmuller, Marius Dichtl, Stefan Bichlmeier, Lars Hoffmann, Manfred Heim